Could antibiotics cause my period to be late?

If you used a barrier method, I wouldn't worry. Antibiotics can interact with some hormonal birth controls. They would have no impact on the effectiveness of barrier methods. And personally as someone who has gotten periods for over two decades, I don't bother worrying until it's at least a week late, maybe two if I've been sick and on medication.

Illness and stress can both cause a delayed period. Stress on your body from the infection for which you were taking the clindamycin is the most likely culprit for your delayed period. By the way....three days late is hardly late. Don't look for something else to worry about.

Yes it can anything unatural that u put in ur body can throw off ur cycle.